Response to Different Exposure index

Large-format photographers (like us) tend to prize a long tonal scale and shadow detail, which requires more exposure. "Exposure controls density, development controls contrast". So we tend to expose more (use a lower EI) and develop less than "normal" to control contrast. The film manufacturers sell their film on speed, so their recommendations are biased that way. The important thing is to find an exposure index/process time combination that gives you negatives that make prints you like easy. Emphasis on "you like". EI/process choices are personal and specific to the work you do. That's the core of the Zone System.

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